aboutsummaryrefslogtreecommitdiff
path: root/source
diff options
context:
space:
mode:
Diffstat (limited to 'source')
-rw-r--r--source/nds/entry.cpp4
-rw-r--r--source/snes9x.h1
-rw-r--r--source/soundux.cpp304
-rw-r--r--source/soundux.h2
4 files changed, 259 insertions, 52 deletions
diff --git a/source/nds/entry.cpp b/source/nds/entry.cpp
index 77620bf..c4cc389 100644
--- a/source/nds/entry.cpp
+++ b/source/nds/entry.cpp
@@ -425,7 +425,9 @@ void init_sfc_setting(void)
//sound settings
Settings.APUEnabled = Settings.NextAPUEnabled = TRUE;
Settings.FixFrequency = 1;
- Settings.InterpolatedSound = TRUE;
+
+ S9xSetEightBitConsoleSound (TRUE);
+
Settings.H_Max = SNES_CYCLES_PER_SCANLINE;
Settings.SkipFrames = AUTO_FRAMERATE;
diff --git a/source/snes9x.h b/source/snes9x.h
index 2661923..ab70efa 100644
--- a/source/snes9x.h
+++ b/source/snes9x.h
@@ -337,6 +337,7 @@ struct SSettings{
#ifndef FOREVER_16_BIT_SOUND
bool8 SixteenBitSound;
#endif
+ bool8 EightBitConsoleSound; // due to caching, this needs S9xSetEightBitConsoleSound()
int SoundBufferSize;
int SoundMixInterval;
bool8 SoundEnvelopeHeightReading;
diff --git a/source/soundux.cpp b/source/soundux.cpp
index c20f366..6998166 100644
--- a/source/soundux.cpp
+++ b/source/soundux.cpp
@@ -168,6 +168,19 @@ extern "C" void DecodeBlockAsm2 (int8 *, int16 *, int32 *, int32 *);
#define LAST_SAMPLE 0xffffff
#define JUST_PLAYED_LAST_SAMPLE(c) ((c)->sample_pointer >= LAST_SAMPLE)
+void S9xSetEightBitConsoleSound (bool8 Enabled)
+{
+ if (Settings.EightBitConsoleSound != Enabled)
+ {
+ Settings.EightBitConsoleSound = Enabled;
+ int i;
+ for (i = 0; i < 8; i++)
+ {
+ SoundData.channels[i].needs_decode = TRUE;
+ }
+ }
+}
+
STATIC inline uint8 *S9xGetSampleAddress (int sample_number)
{
uint32 addr = (((APU.DSP[APU_DIR] << 8) + (sample_number << 2)) & 0xffff);
@@ -803,7 +816,7 @@ void DecodeBlock (Channel *ch)
signed char sample1, sample2;
unsigned char i;
bool invalid_header;
-
+
if (Settings.AltSampleDecode)
{
if (Settings.AltSampleDecode < 3)
@@ -819,74 +832,263 @@ void DecodeBlock (Channel *ch)
ch->block = ch->decoded;
return;
}
- signed char *compressed = (signed char *) &IAPU.RAM [ch->block_pointer];
+
+ if (Settings.EightBitConsoleSound)
+ {
+ signed char *compressed = (signed char *) &IAPU.RAM [ch->block_pointer];
- filter = *compressed;
- if ((ch->last_block = filter & 1))
- ch->loop = (filter & 2) != 0;
+ filter = *compressed;
+ if ((ch->last_block = filter & 1))
+ ch->loop = (filter & 2) != 0;
+
+ int16 interim[16];
+ uint8 interim_byte = 0;
- compressed++;
- signed short *raw = ch->block = ch->decoded;
+ compressed++;
+ signed short *raw = ch->block = ch->decoded;
- // Seperate out the header parts used for decoding
+ // Seperate out the header parts used for decoding
- shift = filter >> 4;
+ shift = filter >> 4;
- // Header validity check: if range(shift) is over 12, ignore
- // all bits of the data for that block except for the sign bit of each
- invalid_header = (shift >= 0xD);
+ // Header validity check: if range(shift) is over 12, ignore
+ // all bits of the data for that block except for the sign bit of each
+ invalid_header = (shift >= 0xD);
+
+ filter = filter&0x0c;
- filter = filter&0x0c;
+ int32 prev0 = ch->previous [0];
+ int32 prev1 = ch->previous [1];
- int32 prev0 = ch->previous [0];
- int32 prev1 = ch->previous [1];
+ int16 amplitude = 0;
- for (i = 8; i != 0; i--)
- {
- sample1 = *compressed++;
- sample2 = sample1 << 4;
- //Sample 2 = Bottom Nibble, Sign Extended.
- sample2 >>= 4;
- //Sample 1 = Top Nibble, shifted down and Sign Extended.
- sample1 >>= 4;
- if (invalid_header) { sample1>>=3; sample2>>=3; }
+ for (i = 8; i != 0; i--)
+ {
+ sample1 = *compressed++;
+ sample2 = sample1 << 4;
+ //Sample 2 = Bottom Nibble, Sign Extended.
+ sample2 >>= 4;
+ //Sample 1 = Top Nibble, shifted down and Sign Extended.
+ sample1 >>= 4;
+ if (invalid_header) { sample1>>=3; sample2>>=3; }
- for (int nybblesmp = 0; nybblesmp<2; nybblesmp++){
- out=(((nybblesmp) ? sample2 : sample1) << shift);
- out >>= 1;
+ for (int nybblesmp = 0; nybblesmp<2; nybblesmp++){
+ out=(((nybblesmp) ? sample2 : sample1) << shift);
+ out >>= 1;
- switch(filter)
- {
- case 0x00:
- // Method0 - [Smp]
- break;
+ switch(filter)
+ {
+ case 0x00:
+ // Method0 - [Smp]
+ break;
- case 0x04:
- // Method1 - [Delta]+[Smp-1](15/16)
- out+=(prev0>>1)+((-prev0)>>5);
- break;
+ case 0x04:
+ // Method1 - [Delta]+[Smp-1](15/16)
+ out+=(prev0>>1)+((-prev0)>>5);
+ break;
- case 0x08:
- // Method2 - [Delta]+[Smp-1](61/32)-[Smp-2](15/16)
- out+=(prev0)+((-(prev0 +(prev0>>1)))>>5)-(prev1>>1)+(prev1>>5);
- break;
+ case 0x08:
+ // Method2 - [Delta]+[Smp-1](61/32)-[Smp-2](15/16)
+ out+=(prev0)+((-(prev0 +(prev0>>1)))>>5)-(prev1>>1)+(prev1>>5);
+ break;
- default:
- // Method3 - [Delta]+[Smp-1](115/64)-[Smp-2](13/16)
- out+=(prev0)+((-(prev0 + (prev0<<2) + (prev0<<3)))>>7)-(prev1>>1)+((prev1+(prev1>>1))>>4);
- break;
+ default:
+ // Method3 - [Delta]+[Smp-1](115/64)-[Smp-2](13/16)
+ out+=(prev0)+((-(prev0 + (prev0<<2) + (prev0<<3)))>>7)-(prev1>>1)+((prev1+(prev1>>1))>>4);
+ break;
+ }
+ CLIP16(out);
+ int16 result = (signed short)(out<<1);
+ if (abs(result) > amplitude)
+ amplitude = abs(result);
+ interim[interim_byte++] = out;
+ prev1=(signed short)prev0;
+ prev0=(signed short)(out<<1);
+ }
+ }
+ ch->previous [0] = prev0;
+ ch->previous [1] = prev1;
+
+ int32 total_deviation_from_previous = 0;
+ for (i = 1; i < 16; i++)
+ total_deviation_from_previous += abs(interim[i] - interim[i - 1]);
+ if (total_deviation_from_previous >= (int32) amplitude * 4)
+ {
+ /* Looks like noise. Generate noise. */
+ for (i = 0; i < 16; i++)
+ {
+ int feedback = (noise_gen << 13) ^ (noise_gen << 14);
+ noise_gen = (feedback & 0x4000) ^ (noise_gen >> 1);
+ ch->decoded[i] = (noise_gen << 17) >> 17;
}
- CLIP16(out);
- *raw++ = (signed short)(out<<1);
- prev1=(signed short)prev0;
- prev0=(signed short)(out<<1);
+ }
+ else if (interim[0] < interim[1] && interim[1] < interim[2]
+ && interim[2] < interim[3]
+ && interim[4] > interim[5] && interim[5] > interim[6]
+ && interim[6] > interim[7] && interim[7] > interim[8]
+ && interim[8] > interim[9] && interim[9] > interim[10]
+ && interim[10] > interim[11]
+ && interim[12] < interim[13] && interim[13] < interim[14]
+ && interim[14] < interim[15])
+ {
+ /* Looks like a sine or triangle wave. Make it a
+ * triangle wave with an amplitude equivalent to that
+ * of the highest amplitude sample of the block. */
+ ch->decoded[0] = ch->decoded[8] = 0;
+ ch->decoded[1] = ch->decoded[7] = amplitude / 4;
+ ch->decoded[2] = ch->decoded[6] = amplitude / 2;
+ ch->decoded[3] = ch->decoded[5] = amplitude * 3 / 4;
+ ch->decoded[4] = amplitude;
+ ch->decoded[9] = ch->decoded[15] = -(amplitude / 4);
+ ch->decoded[10] = ch->decoded[14] = -(amplitude / 2);
+ ch->decoded[11] = ch->decoded[13] = -(amplitude * 3 / 4);
+ ch->decoded[12] = -amplitude;
+ }
+ else if (interim[0] > interim[1] && interim[1] > interim[2]
+ && interim[2] > interim[3]
+ && interim[4] < interim[5] && interim[5] < interim[6]
+ && interim[6] < interim[7] && interim[7] < interim[8]
+ && interim[8] < interim[9] && interim[9] < interim[10]
+ && interim[10] < interim[11]
+ && interim[12] > interim[13] && interim[13] > interim[14]
+ && interim[14] > interim[15])
+ {
+ /* Inverted triangle wave. */
+ ch->decoded[0] = ch->decoded[8] = 0;
+ ch->decoded[1] = ch->decoded[7] = -(amplitude / 4);
+ ch->decoded[2] = ch->decoded[6] = -(amplitude / 2);
+ ch->decoded[3] = ch->decoded[5] = -(amplitude * 3 / 4);
+ ch->decoded[4] = -amplitude;
+ ch->decoded[9] = ch->decoded[15] = amplitude / 4;
+ ch->decoded[10] = ch->decoded[14] = amplitude / 2;
+ ch->decoded[11] = ch->decoded[13] = amplitude * 3 / 4;
+ ch->decoded[12] = amplitude;
+ }
+ else if (interim[0] < interim[1] && interim[1] < interim[2]
+ && interim[2] < interim[3] && interim[3] < interim[4]
+ && interim[4] < interim[5] && interim[5] < interim[6]
+ && interim[6] < interim[7]
+ && interim[8] > interim[9] && interim[9] > interim[10]
+ && interim[10] > interim[11] && interim[11] > interim[12]
+ && interim[12] > interim[13] && interim[13] > interim[14]
+ && interim[14] > interim[15])
+ {
+ /* Looks like a V wave. Make it a half-triangle wave
+ * with an amplitude equivalent to that
+ * of the highest amplitude sample of the block. */
+ ch->decoded[0] = 0;
+ ch->decoded[1] = ch->decoded[15] = amplitude / 8;
+ ch->decoded[2] = ch->decoded[14] = amplitude / 4;
+ ch->decoded[3] = ch->decoded[13] = amplitude * 3 / 8;
+ ch->decoded[4] = ch->decoded[12] = amplitude / 2;
+ ch->decoded[5] = ch->decoded[11] = amplitude * 5 / 8;
+ ch->decoded[6] = ch->decoded[10] = amplitude * 3 / 4;
+ ch->decoded[7] = ch->decoded[9] = amplitude * 7 / 8;
+ ch->decoded[8] = amplitude;
+ }
+ else if (interim[0] > interim[1] && interim[1] > interim[2]
+ && interim[2] > interim[3] && interim[3] > interim[4]
+ && interim[4] > interim[5] && interim[5] > interim[6]
+ && interim[6] > interim[7]
+ && interim[8] < interim[9] && interim[9] < interim[10]
+ && interim[10] < interim[11] && interim[11] < interim[12]
+ && interim[12] < interim[13] && interim[13] < interim[14]
+ && interim[14] < interim[15])
+ {
+ /* Inverted V wave. */
+ ch->decoded[0] = 0;
+ ch->decoded[1] = ch->decoded[15] = -(amplitude / 8);
+ ch->decoded[2] = ch->decoded[14] = -(amplitude / 4);
+ ch->decoded[3] = ch->decoded[13] = -(amplitude * 3 / 8);
+ ch->decoded[4] = ch->decoded[12] = -(amplitude / 2);
+ ch->decoded[5] = ch->decoded[11] = -(amplitude * 5 / 8);
+ ch->decoded[6] = ch->decoded[10] = -(amplitude * 3 / 4);
+ ch->decoded[7] = ch->decoded[9] = -(amplitude * 7 / 8);
+ ch->decoded[8] = -amplitude;
+ }
+ else
+ {
+ // Make it a square wave with an amplitude equivalent to that
+ // of the highest amplitude sample of the block.
+ // But actually put half of the amplitude, because
+ // square waves are just loud.
+ for (i = 0; i < 8; i++)
+ ch->decoded[i] = amplitude / 2;
+ for (i = 8; i < 16; i++)
+ ch->decoded[i] = -(amplitude / 2);
}
}
- ch->previous [0] = prev0;
- ch->previous [1] = prev1;
+ else
+ {
+ signed char *compressed = (signed char *) &IAPU.RAM [ch->block_pointer];
- ch->block_pointer += 9;
+ filter = *compressed;
+ if ((ch->last_block = filter & 1))
+ ch->loop = (filter & 2) != 0;
+
+ compressed++;
+ signed short *raw = ch->block = ch->decoded;
+
+ // Seperate out the header parts used for decoding
+
+ shift = filter >> 4;
+
+ // Header validity check: if range(shift) is over 12, ignore
+ // all bits of the data for that block except for the sign bit of each
+ invalid_header = (shift >= 0xD);
+
+ filter = filter&0x0c;
+
+ int32 prev0 = ch->previous [0];
+ int32 prev1 = ch->previous [1];
+
+ for (i = 8; i != 0; i--)
+ {
+ sample1 = *compressed++;
+ sample2 = sample1 << 4;
+ //Sample 2 = Bottom Nibble, Sign Extended.
+ sample2 >>= 4;
+ //Sample 1 = Top Nibble, shifted down and Sign Extended.
+ sample1 >>= 4;
+ if (invalid_header) { sample1>>=3; sample2>>=3; }
+
+ for (int nybblesmp = 0; nybblesmp<2; nybblesmp++){
+ out=(((nybblesmp) ? sample2 : sample1) << shift);
+ out >>= 1;
+
+ switch(filter)
+ {
+ case 0x00:
+ // Method0 - [Smp]
+ break;
+
+ case 0x04:
+ // Method1 - [Delta]+[Smp-1](15/16)
+ out+=(prev0>>1)+((-prev0)>>5);
+ break;
+
+ case 0x08:
+ // Method2 - [Delta]+[Smp-1](61/32)-[Smp-2](15/16)
+ out+=(prev0)+((-(prev0 +(prev0>>1)))>>5)-(prev1>>1)+(prev1>>5);
+ break;
+
+ default:
+ // Method3 - [Delta]+[Smp-1](115/64)-[Smp-2](13/16)
+ out+=(prev0)+((-(prev0 + (prev0<<2) + (prev0<<3)))>>7)-(prev1>>1)+((prev1+(prev1>>1))>>4);
+ break;
+
+ }
+ CLIP16(out);
+ *raw++ = (signed short)(out<<1);
+ prev1=(signed short)prev0;
+ prev0=(signed short)(out<<1);
+ }
+ }
+ ch->previous [0] = prev0;
+ ch->previous [1] = prev1;
+ }
+ ch->block_pointer += 9;
}
static inline void MixStereo (int sample_count)
diff --git a/source/soundux.h b/source/soundux.h
index b603df8..b57e945 100644
--- a/source/soundux.h
+++ b/source/soundux.h
@@ -220,6 +220,8 @@ typedef struct
EXTERN_C SSoundData SoundData;
+void S9xSetEightBitConsoleSound (bool8 Enabled);
+
void S9xSetSoundVolume (int channel, short volume_left, short volume_right);
void S9xSetSoundFrequency (int channel, int hertz);
void S9xSetSoundHertz (int channel, int hertz);
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-30 12:48:48 +0000